C Programming Questions and Answers – Register Variables
C Programming Questions and Answers – Register Variables
1.What is the output of this C code?
#include <stdio.h>
int main()
{
register int i = 10;
int *p = &i;
*p = 11;
printf(“%d %d\n”, i, *p);
}
a) Depends on whether i is actually stored in machine register
b) 10 10
c) 11 11
d) Compile time error
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2.register keyword mandates compiler to place it in machine register.
a) true
b) false
c) Depends on the standard
d) None of the mentioned
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3.What is the output of this C code?
#include <stdio.h>
int main()
{
register static int i = 10;
i = 11;
printf(“%d\n”, i);
}
a) 10
b) Compile time error
c) Undefined behaviour
d) 11
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4.What is the output of this C code?
#include <stdio.h>
int main()
{
register auto int i = 10;
i = 11;
printf(“%d\n”, i);
}
a) 10
b) Compile time error
c) Undefined behaviour
d) 11
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5.What is the output of this C code?
#include <stdio.h>
int main()
{
register const int i = 10;
i = 11;
printf(“%d\n”, i);
}
a) 10
b) Compile time error
c) Undefined behaviour
d) 11
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6.Register storage class can be specified to global variables
a) true
b) false
c) Depends on the compiler
d) Depends on the standard
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7.Which among the following is wrong for “register int a;” ?
a) Compiler generally ignores the request.
b) You cannot take the address of this variable
c) Access time to a is critical
d) None of the mentioned
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8.What is the output of this C code?
#include <stdio.h>
void main()
{
register int x = 5;
m();
printf(“x is %d”, x);
}
void m()
{
x++;
}
a) 6
b) 5
c) Junk value
d) Compile time error
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9.When compiler accepts the request to use the variable as a register?
a) It is stored in CPU
b) It is stored in cache memory
c) It is stored in main memory
d) It is stored in secondary memory
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10.Which data type can be stored in register?
a) int
b) long
c) float
d) All of the mentioned
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11.Which of the following operation is not possible in a register variable?
a) Reading the value into a register variable
b) Copy the value from a memory variable
c) Global declaration of register variable
d) All of the mentioned
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12.Which among the following is the correct syntax to declare a static variable register?
a) static register a;
b) register static a;
c) Both (a) and (b)
d) We cannot use static and register together.
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13.Register variables reside in
a) stack
b) registers
c) heap
d) main memory
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14.What is the output of this C code?
#include <stdio.h>
void main()
{
register int x = 0;
if (x < 2)
{
x++;
main();
}
}
a) Segmentation fault
b) main is called twice
c) main is called once
d) main is called thrice
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15.What is the output of this C code?
#include <stdio.h>
void main()
{
register int x;
printf(“%d”, x);
}
a) 0
b) Junk value
c) Compile time error
d) Noting
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16.What is the output of this C code?
#include <stdio.h>
register int x;
void main()
{
printf(“%d”, x);
}
a) varies
b) 0
c) Junk value
d) Compile time error
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